Apparatus for withdrawing the air from steam-heating installations.



A. SGHOLL. APPARATUS FOR WITHDBAWING THE AIR FROM STEAM HEATING INSTALLA APPLIUATION FILED NOV. 29, 1907.

Patented Jan. 26, 1909.

Hans.- 9 1 0,588

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V done hitherto by means of power drlven air imrrnn s'ra'rnsrn'rntr orrron ALBERT SOHOLL, OF MANNI-IEIM, GERMANY.

APPARATUS FOR WITHDRAWING THE AIR FROM STEAM-HEATING INSTALLATIONS.

Patented Jan. 26, 1909.

Application filed November 29, 1907. Serial No. 404,407.

No. 910,588. Specification of Letters Patent.

To all whom it may concern:

- of the casing. If however, instead of steam, Be it known that I, ALBERT SoHoLL, a subair (which is colder) enters the casing, the

ject of the German Emperor, and residing tube, 7c, will contract and thereby allow the at 3 Friedrich-Karlstrasse, Mannheim, 1n valve, 1, to be drawn by the spring m, away the Empire of Germany, have invented an I from the outlet, a, which is thus opened. Improved Apparatus for Withdrawing the l The air-withdrawing apparatus comprises Air from Steam-Heating Installations, of i a cistern 9 (Fig. 3) containing an open which the following is a specification. l topped float, 0, which carries on its bottom In working steam heating installations a valve, p, and at the top by means of two having radiators, it is usual to withdrawthe arms q, a horizontal bar, 2. This bar extends through a passage, 8, in the cistern air therefrom for the purpose of obtaining a cover and is provided in its middle with a heating effect with the same low temperature of the radiators as in the case with hot projection t, over which is situated an inlet valve, a, of the pressure water supply.

water heating installations. This has been '0 IS an air suction valve, and w is an air delivery valve.

e is the pipe (shown in Fig. 1) for withdrawing the air from the steam heating installation.

h is the pressure water supply pipe, and i is the waste water pipe.

x is a siphon tube cast in one piece with the cover of the cistern, g; it extends down to near the bottom of the float, 0, where its lower end is formed as a seat for the valve, 1). The pipe, 71, is connected at its upper end to the siphon tube as, and it dips at its lower end in a water tank, y, wherein it is kept immersed always below the level of the water for the purpose of preventing the entrance of air. If the pressure of the air which is to be withdrawn is equal to, or less than the pressure of the atmosphere, the tank, y, must be situated on a lower level than the cistern g.

pumps.

N ow according to this invention, the withdrawal of the air is effected automatically by means of apparatus worked by water under pressure. Such automatic apparatus are not only much cheaper as regards first cost and working than the air pumps above referred to, but also they do not require the constant attention necessitated by those.

For the purpose of preventing an apparatus of this kind from also withdrawing steam from the installation, a valve of any suitable known construction operated by a difference in temperature may be inserted in front of the apparatus.

In the accompany ng drawings, Figure 1 illustrates diagrammatically a steam heating installation comprising a valve of the kind above referred to, and an automatic apparatus for withdrawing the air fromsaid m- But if the air pressure is greater than atmosstallation. Figs. 2 and 3 are vertical sec pheric pressure, then the tank y, may be tions showing respectively by way of example, practical forms of the valve and the air-withdrawing apparatus. In the steam heating installation shown in Fig. 1, (1 indicates the steam boiler, b the steam supply pipe, and two radiators, d is The float, 0, and the valves, 1) the pipe for carrying off the water of conthenoccupy densjptionfie is tllie pipefoplwithdrawiong tfhe 1n Flgl. 31.J Eh fr H air; is ie va veg 18 ie appara us or now 0 e wi orawn om .ie pipe e. withdrawing the aif; h is the pipe supplying Since the tank, y, is on a lower level than the wager under pressure; and '2', is the waste I cisternfi, g, the Wgtiilr in thp lflittep las a tendc-1 wa er pipe. ency orun o ougi 1e u e, a; an

The valve f, (Fig. 2) consists of a casing I plpe, a, into the tank, y, and thus to sick in containing a small semicircular spring tube air through the valvefio, into the cisterrlil, g. k which is filled with a liquid of low boiling In the position of the oat, 0, as shown t ere pbint. This tube is fixed at one end to the I is left between the projection t, and the valve, casing, and its other free end carries a plug l a, a small space by I lrli ueans of which thisgvalyle valve Z. When steam enters the casing \can be kept down mly upon its seat yt e the tribe 7c, expands with the heat and there pressure of the water supply. But as soon as by causes the valve, Z, to close the outlet, 1, l the water level inside the float, 0, has fallen to situated on a higher level than the cistern, 9.

The manner of operation of the improved apparatus is as follows ;It is assumed that the cistern, 9, the float, 0, the tube, :0, the pipe, '5, and the tank, 1,1,

and a, will the respective positions shown All at atmospheric pressure is are full of water. a

' open, and the outlet valve, p,

in combination, a casing provided with an weight, the float will begin to rise and the air inlet and a non-return valve therefor and projection, 25, will come in contact with the I an air outlet provided with a non-return valve, u. When the increasing buoyancy of I valve, an inlet for said casing communicatthe float is able to overcome the pressure I ing with a source of supply of liquid under acting to close the valve, u, the latter will pressure, a non-return valve for said liquid will be closed. I inlet, a siphon having one limb extending the point where its buoyancy is equal to its he water coming from the supply pipe, it, into said casing, a float in said easing into flows through the open valve, u, and through which said siphon limb projects, a valve for the passage 8, into the annular space inl said float controlling said siphon, and an eluded between the cistern, g, and the float, l actuating member for said float controlling 0, (in which space the water level had sunk the non-return valve of said liquid inlet. by reason of the ascent of the float) and 2. A hydraulic air exhauster for steam thence into the interior of the float. In so heating system comprising a casing provided doing the water fills first the space between with a non-return valve connection with the the cistern and the float, and thereby inheating system, a non-return valve air outcreases the buoyancy of the float, 0, and conlet for said casing, a non-return valve inlet sequently also increases the force required for said casing connected with a source of for reversing the action of the apparatus. supply of liquid under pressure, a float for At the same time the air contained in the cissaid casing provided with an actuating tern, g, is compressed, and, when it has acmember for operating said liquid inlet quired the requisite pressure it opens and esvalve, and a siphon having one limb procapes through the valve, in, into the air esjecting into said float, said float being procape pipe connected thereto. vided with a valve controlling said siphon, At the commencement of the compression and means controlling said exhauster to the valve p, is pressed against its seat by the I prevent the exhaust of steam from said buoyancy of the float, 0. With increasing system. compression the buoyancy is replaced by the 3. A hydraulic air exhauster for steam difference between the pressure of the atmosheating system comprising in combination, phere and the pressure in the cistern, 9. a casing provided with a valve connection The moment when so much water has enwith the heating system, an air outlet for tered the float, 0, as will render the buoyancy said casing provided with a valve, a valve of the latter equal to its weight, the weight pressure liquidinlet for said casing, a float of the float will begin to act in opposition to for said casing provided with an actuating the difference between the pressure in the member adapted to cooperate with the cistern g, and that of the atmosphere. valve of said pressure liquid inlet, means Shortly before the float, 0, becomes fullof l acting normally to withdraw the contents water and its buoyancy attains its minimum, from said float, said float being provided the weight of the float will overcome the with a device for controlling said means, difference between the pressure in the cis- I means associated with the heating system tern, g, and that of the atmosphere, and said exhauster for preventing the latter open the valve, p, while the valve, u, will i from exhausting steam from said system. be closed by the pressure of the water supply. 4. An apparatus of the class described As the float, 0, descends, the liquid which is comprising in combination, a steam heating displaced from the lower space between the system, a hydraulic air exhauster for excistern and the float, will flow over the upper l hausting air from said system and including edge of the float into the latter, and thereby I a liquid pressure supply, a withdrawing further diminish the buoyancy of the float siphon, and a float controlling said liquid and increase the downwardly directed force supply and siphon, and means associated acting to reverse the operation of the apwith said system and exhauster and conparatus. The inflowing water will flow out trolled by the temperature of the system through the tube, x, and the pipe, i, into the and automatically starting and arresting tank, y, whereupon the air which it is dethe exhauster. sired to withdraw, is now again able to pass l In testimony whereof I have hereunto through the valve, 2), into the cistern, g, and I signed my name to this specification in the the hereinbefore described sequence of operpresence of two subscribing witnesses. ations will commence anew.

What I claim as my invention and desire l to secure by Letters Patent is2- 1. A hydraulic air exhauster comprising ALBERT SOHOLL. Witnesses:

TERESA CATTURANI, Jos. H. LE TE. 

